Electrical junction box system for diverse vehicles and electrical junction box therefor

ABSTRACT

For a first vehicle kind requiring a first internal circuit to have a first connection circuit for connection of a first set of electrical inserts or a second vehicle kind requiring a second internal circuit to have a second connection circuit for connection of a second set of electrical inserts, the first and second connection circuits being different from each other, a case member is molded with external portions for installation of a corresponding one of the first and second sets of electrical inserts and an internal space including a channel network, and has installed in the internal space the first internal circuit with a first connection circuit composed of a combination of first bus bars set in the channel network, or the second internal circuit with the second connection circuit composed of a combination of second bus bars set in the channel network.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention generally relates to an electrical junction boxsystem for various kinds of vehicles, and particularly, it relates to anelectrical junction box system including: a first junction box forelectrical connection in a kind of vehicle, e.g. a vehicle with asteering wheel at a left side thereof; and a second junction box forelectrical connection in another kind of vehicle, e.g. a vehicle withanother that steering wheel at a right side thereof while the remainingspecifications of this vehicle are substantially identical to thatvehicle.

The invention further relates to an electrical junction box for such asystem, the electrical junction box being of the type that includes amolded casing body or housing assembly (hereafter collectively "casemember") configured to provide: a plurality of external portions forelectrical application, e.g. external openings for insertion of fuses,relays and/or plugs (hereafter collectively "electrical inserts"); andan internal space for installation of conductors, connectors, contacts,etc. (hereafter collectively "internal circuit") using bus bars forbranchable interconnections among the electrical inserts.

2. Description of Relevant Art

There are known varieties of vehicles. They have their wiring harnessmembers including electrical junction boxes, whose internal circuitsusually are different in arrangement (e.g. bus bar layout), such as byvehicle types and grades. Typically, a respective kind of vehicle has anelectrical junction box designed for itself, needing a dear cost such asfor molding a dedicated case member.

To reduce such a molding cost, there was provided an electrical junctionbox system for optionable vehicles, which system includes a basicjunction box having a common case member with a common internal circuit,and varieties of optionable junction boxes having their dedicated casemembers with dedicated internal circuits employable in combination with,i.e., in addition to the common internal circuit, as necessary.

For a mere addition of internal circuit, an addition of an optionedjunction box might have done. It however would not, for vehiclesdifferent in type and/or grade. In such a case, electric wires werenecessary for connection to effect a modification of internal circuit.

Further, for a systemization of diverse grades of a type of vehicle,there has been proposed an electrical junction box shown in FIG. 1,which includes a molded case member composed of an upper case 1 and alower case 4, which cases 1, 4 cooperatively define an internal spacefor installation of a basic internal circuit 2 and a high-gradededicated internal circuit 3.

The basic circuit 2 is formed on a pair of upper and lower laminationsubstrates 2a, 2b; and the dedicated circuit 3, on a dedicatedlamination substrate. The internal circuits 2, 3 are constituted byusing horizontal bus bars 2c, 3a, whose end parts are bent to standupright as terminals, extending through openings 2d, 2e that are formedin substrates 2a, 2b on the way for the terminals to gain access towardexternal application portions 1a, 1b, 1c, 1d, as they are formed on theupper case 1 for application of unshown electrical inserts. Theapplication portions 1a-1d have their positions staggered incorrespondence to terminals formed at ends of associated horizontal busbars.

The electrical junction box of FIG. 1 is employed also for a moderategrade vehicle that does not need the high-grade dedicated circuit 3. Inthis case, the dedicated circuit 3 becomes futile, resulting in thedearer production cost.

SUMMARY OF THE INVENTION

The present invention has been achieved with such points in mind.

It therefore is a first object of the present invention to provide anelectrical junction box system for diverse vehicles needing differentinternal circuits, achieving a reduced molding cost, permitting areduced production cost.

It is a second object of the invention to provide an electrical junctionbox adaptive for such a system.

To achieve the first object, a first aspect of the invention provides anelectrical junction box system (5) for a first vehicle kind requiring afirst internal circuit (11) to have a first connection circuit (130) forconnection of a first set of electrical inserts (Fa, Ra) and a secondvehicle kind requiring a second internal circuit (12) to have a secondconnection circuit (140) for connection of a second set of electricalinserts (Fb, Rb), the first and second connection circuits (130, 140)being different from each other, the electrical junction box system (5)including: a first junction box (5a) comprising a case member (10)molded for defining a plurality of external portions (6, 8) forinstallation of the first set of electrical inserts (Fa, Ra) and aninternal space including a channel network (16), and the first internalcircuit (11) installed in the internal space, with the first connectioncircuit (130) composed of a combination of first bus bars (13) set inthe channel network; and a second junction box (5b) comprising anothersaid case member (10) defining said plurality of external portions (6,8) for installation of the second set of electrical inserts (Fb, Rb),and the second internal circuit (12) installed in said internal space ofsaid another case member (10), with the second connection circuit (140)composed of a combination of second bus bars (14) set in said channelnetwork (16) of said another case member (10).

According to the first aspect, an electrical junction box system isprovided for diverse vehicles covering a first vehicle kind and a secondvehicle kind. The electrical junction box system includes a firstjunction box for application to the first vehicle kind and a secondjunction box for application to the second vehicle kind. The firstjunction box comprises a case member and a first internal circuitincluding a first connection circuit. The second junction box comprisesa case member and a second internal circuit including a secondconnection circuit that is different from the first connection circuit.This and that case members are identical to each other, and each have aplurality of external installation portions and an internal spaceincluding a channel network. The internal space is for installation of acorresponding one of the first and second internal circuits, and thechannel network is for insetting a corresponding one of the first andsecond connection circuits.

On the other hand, some circuit for the first vehicle kind includes thefirst internal circuit, and a first set of electrical inserts to beconnected by the first connection circuit as part of the first internalcircuit. Some circuit for the second vehicle kind includes the secondinternal circuit, and a second set of electrical inserts to be connectedby the second connection circuit as part of the second internal circuit.A remaining part of the second internal circuit may be identical to ordifferent from a remaining part of the first internal circuit, as thefirst and second internal circuits are each permitted to be installed inthe internal space. Likewise, the second set of electrical inserts maybe identical to or different from the first set of electrical inserts,in number and/or characteristics.

In application of the system to the first vehicle kind, the first set ofelectrical inserts are installed in corresponding ones of the pluralityof external portions.

In application to the second vehicle kind, the second set of electricalinserts are installed in corresponding ones of the plurality of externalportions.

Accordingly, the case member is permitted to serve as a common member,and can be molded by using a mold.

According to a second aspect of the invention, as it depends from thefirst aspect: the first set of electrical inserts (Fa, Ra; Fb, Rb)comprise a number of upstream insert members (Ra; Rb) and a number ofdownstream insert members (Fa; Fb); and the plurality of externalportions (6, 8) comprise a first series (7) of housing parts (6) alignedto a first reference line (y-1) and adapted for accommodation of thenumber of upstream insert members (Ra, Rb), and a second series (9) ofhousing parts (8) aligned to a second reference line (y-N) parallel tothe first reference line (y-1) and adapted for accommodation of thenumber of downstream insert members (Fa; Fb).

According to the second aspect, a number of upstream insert members anda number of downstream insert members are aligned in parallel in anopposing manner, allowing an alignment of serially connectable terminalsfor those members as well as for these members, permitting a smallernumber of bus bars to be arranged for interconnection in a simplifiedmanner.

According to a third aspect of the invention, as it depends from thesecond aspect, the upstream insert members each comprise a relay member(Ra; Rb).

According to a fourth aspect of the invention, as it depends from thesecond aspect, the downstream insert members each comprise a fuse member(Fa; Fb).

According to a fifth aspect of the invention, as it depends from thesecond aspect, the first set of electrical inserts further comprise anumber of power supply inserts (B-24, B-35, A-13, A-17; B-34, B-35,A-17), and the case member (10) has a third series of housing partsaligned to a third reference line (y-(j+1)) parallel to the firstreference line (y-1) and adapted for accommodation of the number ofpower supply inserts.

According to the fifth aspect, a number of power supply inserts as mostupstream members are aligned in parallel to the number of upstreaminsert members and the number of downstream insert members.

According to a sixth aspect of the invention, as it depends from thefifth aspect, the channel network (160) comprises a first channel(160-1) extending along a first reference plane including the firstreference line (y-1), a second channel (160-2, 160-3) extending along asecond reference plane including the second reference line (y-N), athird channel (160-4, 160-5. 160-6, 160-7, 160-8) extending along athird reference plane including the third reference line (y-(j+1)), anumber of fourth channels (160-10, 160-12) for intercommunicationbetween the first channel (160-1) and the second channel (160-2, 160-3),and a number of fifth channels (160-13, 160-14, 160-15, 160-16, 160-17)for intercommunication between the first channel (160-1) and the thirdchannel (160-4, 160-5, 160-6, 160-7, 160-8).

According to the sixth aspect, in a plan view, a first channel extendingin an alignment direction of upstream insert members communicates with asecond channel extending in an alignment direction of downstream insertmembers, and with a third channel extending in an alignment direction ofpower supply inserts as the most upstream insert members.

According to a seventh aspect of the invention, as it depends from thesixth aspect, the combination of first bus bars (13; 14) includes afirst bus bar member (13a 13b; 14a) passing the first channel, one ofthe number of fourth channels, and the second channel, and a second busbar member (13c, 13d, 13e, 13f, 13g; 14c, 14d, 14e, 14f) passing thefirst channel, one of the number of fifth channels, and the thirdchannel.

According to an eighth aspect of the invention, as it depends from thefirst aspect, the combination of first bus bars (13; 14) each comprise avertical bus bar member.

Further, to achieve the second object, a ninth aspect of the inventionprovides an electrical junction box (5) for a first vehicle kindrequiring a first internal circuit (11) to have a first connectioncircuit (130) for connection of a first set of electrical inserts (Fa,Ra) and a second vehicle kind requiring a second internal circuit (12)to have a second connection circuit (140) for connection of a second setof electrical inserts (Fb, Rb), the first and second connection circuits(130, 140) being different from each other, the electrical junction box(5) comprising: a case member (10) molded for defining a plurality ofexternal portions (6, 8) for installation of a selective one of thefirst and second sets of electrical inserts (Fa, Ra; Fb, Rb), and aninternal space including a channel network (16); the first internalcircuit (11) being adapted to be installed in the internal space, withthe first connection circuit (130) composed of a combination of firstbus bars (13) set in the channel network; and the second internalcircuit (12) being adapted to be installed in the internal space, withthe second connection circuit (140) composed of a combination of secondbus bars (14) set in the channel network (16).

According to the ninth aspect, an electrical junction box permits theprovision of a system according to the first aspect.

According to a tenth aspect of the invention, as it depends from theninth aspect, the case member comprises a casing body (10) of a boxform, said selective one of the first and second sets of electricalinserts (Fa, Ra; Fb, Rb) comprises a number of relay members (Ra; Rb)and a number of fuse members (Fa; Fb), and the plurality of externalportions (6, 8) comprise a first series (7) of housing parts (6) alignedin a longitudinal direction of the casing body (10) and adapted forinstallation of the number of relay members (Ra; Rb) and a second series(9) of housing parts (8) aligned in parallel to the first series (7) ofhousing parts (6) and adapted for installation of the number of fusemembers (Fa; Fb).

According to an eleventh aspect of the invention, as it depends from thetenth aspect, the first and second connection circuits (130; 140) eachinclude a bus bar member (13b; 14a) having an elongate base portion (22)set at a relay connection part thereof in a first channel (160-1) of thechannel network (16) facing the number of relay members (Ra; Rb), and ata fuse connection part thereof in a second channel (160-3) of thechannel network (16) facing the number of fuse members (Fa; Fb), theelongate base portion having an interconnection part interconnecting therelay connection part and the fuse connection part.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

The above and further objects and novel features of the presentinvention will more fully appear from the following detailed descriptionwhen the same is read in conjunction with the accompanying drawings, inwhich:

FIG. 1 is an exploded view of a conventional electrical junction box;

FIG. 2 is an exploded view, cut in part, of an electrical junction boxfor an electrical junction box system according to an embodiment of theinvention;

FIG. 3 is a bottom view of a channel network in a case member of theelectrical junction box of FIG. 2;

FIGS. 4A and 4B illustrate a total number of first bus bars and that ofsecond bus bars, respectively, to be either set in the channel networkof FIG. 3;

FIGS. 5A and 5B show the first bus bars and the second bus bars, as theyare set in the channel network of the case member of FIG. 3,respectively;

FIGS. 6A and 6B are detailed views of FIGS. 5A and 5B, respectively;

FIGS. 7A and 7B are circuit diagrams of a first internal circuit and asecond internal circuit, respectively; and

FIG. 8 is an illustration describing a layout concept of the channelnetwork of FIG. 3.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

There will be detailed below the preferred embodiments of the presentinvention with reference to the accompanying drawings: FIG. 2 to FIG. 8,in which like members are designated by like reference characters.

FIG. 2 shows principal components of an electrical junction box system 5for diverse vehicles, covering a first vehicle kind in which a drivermay be left seated and a second vehicle kind in which a driver may beright seated.

As partly shown in FIGS. 6A and 6B, the electrical junction box system 5includes in a line thereof a first junction box 5a for application tothe first vehicle kind and a second junction box 5b for application tothe second vehicle kind.

The first junction box 5a comprises: a molded case member 10+15(hereafter sometimes simply "10") composed of a main or upper case 10 asa casing body and a lower case 15 (FIG. 2) that may be modified byvehicle kinds; and a first internal circuit 11 (FIG. 7A) including afirst connection circuit 130 (FIG. 5A) comprised of vertical bus bars13a to 131 each having an elongate base portion 22 (FIG. 2) andterminals 23 extending parallel thereto.

The second junction box 5b comprises: an identical case member 10+15;and a second internal circuit 12 (FIG. 7B) including a second connectioncircuit 140 (FIG. 5B) comprised of vertical bus bars 14a to 14g eachhaving an elongate base portion 22 and parallel terminals 23. The secondconnection circuit 140 is different from the first connection circuit130.

This and that case members 10 each have a plurality of externalinstallation portions 6, 8 (FIGS. 2; 6A, 6B; reference numerals 6, 8 arerepresentative of associated power supply points, as necessary) and aninternal space defined between the upper and lower cases 10, 15, whichinternal space includes a channel network 16 (FIG. 3). The internalspace is for installation of a selective one of the first and secondinternal circuits 11, 12, and the channel network 16 is for insetting acorresponding one of the first and second connection circuits 130, 140.

On the other hand, some circuit (FIG. 7A) for the first vehicle kindincludes: the first internal circuit 11; and a first set of electricalcomponents such as relays Ra, fuses Fa, and connectors or terminals orplugs (hereafter collectively "connectors") A1 to A17 and B18 to B20,B25 to B35, including power supply connectors B-24, B-35, A-13, A-17, tobe directly or indirectly connected by the first connection circuit 130that constitutes part of the first internal circuit 11. The first set ofelectrical components includes a first set of electrical insertsconsisting of the relays Ra, fuses Fb, and power supply connectors B-24,B-35, A-13. A-17.

Some circuit (FIG. 7B) for the second vehicle kind includes: the secondinternal circuit 12; and a second set of electrical components such asrelays Rb, fuses Fb, and various connectors A1, A2, A4 to A17 and B18 toB35, including power supply connectors B-34, B-35. A-17, to be directlyor indirectly connected by the second connection circuit 140 thatconstitutes part of the second internal circuit 12. The second set ofelectrical components includes a second set of electrical insertsconsisting of the relays Rb, fuses Fb, and power supply connectors B-34,B-35, A-17.

In application of the system 5 to the first vehicle kind, the first setof electrical inserts are installed in corresponding ones of theplurality of external portions 6, 8. In application to the secondvehicle kind, the second set of electrical inserts are installed incorresponding ones of the plurality of external portions 6, 8.

Accordingly, at least the main case 10 is permitted to serve as a commonmember, and can be molded by using a mold.

The first set of electrical inserts includes a total of five relays Raas upstream insert members, and a total of 23 fuses Fa of which 13 areinsert members provided downstream of the five relays Ra, while theremaining 8 are placed downstream of the power supply connector B-24.The second set of electrical inserts includes a total of four relays Rbas upstream insert members, and a total of 23 fuses Fb of which 8 areprovided downstream of the four relays Rb, while the remaining 15 areplaced downstream of the power supply connector B-34.

As shown in FIG. 2, the plurality of external portions 6, 8 include: afirst series 7 of housing parts 6 aligned along a rear long side of aright part of the box-shaped main case 10 and adapted for accommodationof at most five of a total of nine (=5+4) relays Ra. Rb; a second series9 of housing parts 8 aligned along a front long side of the right partof the main case 10 and adapted for accommodation of at most 13 of atotal of 21 (=13+8) fuses Fa, Fb downstream of relays; a pair of frontand rear series 9 of housing parts 8 aligned along front and rear longsides of a left part of the main case 10 and adapted for accommodationof at least 25 fuses Fa, Fb downstream of power supply connectors; and aseries of connector housing parts aligned in parallel to the first andsecond series 7, 9 of housing parts, placed in between, and adapted fora mating with at most four of a total of seven (=4+3) power supplyconnectors.

The case member 10 is designed in a three-dimensional design fielddefined by an X-Y-Z coordinate system.

FIG. 8 has mapped the case member 10 in the design field, where it isobserved along an unshown Z-axis. The design field has a plurality oflongitudinal reference planes each parallel to an X-Z plane andrepresentative by an associated y-coordinate or by a straight linepassing the y-coordinate, and a plurality of transverse reference planeseach parallel to a Y-Z plane and representative by an associatedx-coordinate or by a straight line passing the x-coordinate. Thelongitudinal reference planes as well as the transverse reference planesare disposed at various intervals, meeting associted standards andrequirements.

In the design field, the case member 10 has an imaginary channel network160 continuously prescribed along adequate ones (y-1, . . . , y-j,y-(j+1), . . . , y-M; x-1, . . . , x-j,x-(j+1), . . . , x-M) of thelongitudinal and transverse reference planes, including straightchannels 160a, corners 160b of a specified radius of curvature,intentional breaks 160c for communication that can be shut, bendchannels 160d with the specified radius of curvature, and bus barlocking channels 160e to thereby provide channels 160-1 to 160-17 ofwhich a total corresponds to the channel network 16, subject to closedbreaks and ends which may be left open for better communications.

Further, the accompanying drawings concurrently disclose an electricaljunction box 5 for the described system in accordance with theinvention.

As shown in FIG. 2, the junction box 5 includes: a relay fitting group 7comprised of a set of relay fitting parts 6 for fitting relays; fusefitting groups 9 comprised of a set of fuse fitting parts 8 for fittingfuses; a casing body 10 of a rectangular parallelepiped form providedwith the relay fitting group 7 and the fuse fitting groups 9; a set ofbus bars 13a-131, 14a-14g (an exemplary one is shown in FIG. 2) to beincorporated in the casing body 10 to constitute power distributingbranch circuits 11, 12 (FIGS. 7A, 7B); connectors or terminals 20, 21for connections between the bus bars and terminals of fuses and relays;and an under cover as a lower case 15.

As shown in FIGS. 6A, 6B, the junction box 5 has the relay fitting group7 disposed at one side of the casing body 10, with the relay fittingparts 6 aligned in series, and the fuse fitting groups 9 disposed atboth sides of the casing body 10, with their fuse fitting parts 8aligned in series. Between the relay fitting group 7 and the fusefitting groups 9 as well as between the fuse fitting groups 9, there areprovided bus bar installation channels or grooves (as arrangement path)16 formed in the casing body 10 for setting therein the bus bars13a-13i, 14a-14g.

As shown in FIG. 3, the bus bat installation channel 16 is continuouslyformed between fuse fitting parts 8, as well as between the relayfitting parts 6 and the fuse fitting parts 8. In the bus barinstallation channel 16 are set in position the bus bars 13a-13i of FIG.6A to constitute the power distribution circuit 11 (FIG. 7A), and thebus bars 14a-14g of FIG. 6B to constitute the power distribution circuit12 (FIG. 7B).

The bus bars 13a-13i have different forms to the bus bars 14a-14g sothat the distribution circuit 11 formed by the those bus bars isdifferent in circuit configuration from the distribution circuit 12formed by these bus bars, as they are set in the bus bar installationchannel 16.

As shown in FIGS. 4A, 4B, a plurality of kinds of different bus bars13a-13i, 14a-14g have a basic form comprised of a relay side baseportion 17 to be inserted in a relay fitting part 6, a fuse side basicportion 18 to be inserted in a fuse fitting part 8, and a connectingbase portion 19 for interconnection between the relay side base portion17 and the fuse side base portion 19, while the relay side base portion17 is different in length from the fuse side base portion.

The bus bars 13a-13i of FIG. 4A are set in the bus bar installationchannel 16 in a layout shown in the figure, to be arranged as in FIG. 5Ato constitute the power distribution circuit 11 of FIG. 7A.

Likewise, the bus bars 14a-14g of FIG. 4B are set in the bus barinstallation channel 16 in a layout shown in the figure, to be arrangedas in FIG. 5B to constitute the power distribution circuit 12 of FIG.7B.

FIG. 5A illustrates the bus bar installation channel 16 and the bus bars13a-13i set therein, as they are picked up from the view of FIG. 6A.FIG. 5B illustrates the bus bar installation channel 16 and the bus bars14a-14g set therein, as they are picked up from the view of FIG. 6B.

The power distribution circuits 11, 12 of FIGS. 7A, 7B are installed inthe case member 10 in a following manner.

For the distribution circuit 11 of FIG. 7A to be built in the casemember 10, the bus bars 13a-13i of FIG. 4A are set in the bus barinstallation channel 16 as shown in FIG. 5A, in the layout of FIG. 4A,to have an installation state of FIG. 6A, where they interconnect therelay fitting group 7 with the fuse fitting groups 9, and one fusefitting group 9 with the other fuse fitting group 9.

For the distribution circuit 12 of FIG. 7B to be built in the casemember 10, the bus bars 14a-14g of FIG. 4B are set in the bus barinstallation channel 16 as shown in FIG. 5B, in the layout of FIG. 4A,to have an installation state of FIG. 6B, where they interconnect therelay fitting group 7 with the fuse fitting groups 9, and one fusefitting group 9 with the other fuse fitting group 9.

According to the embodiment, an electrical junction box 5 has a bus barinstallation channel 16 formed in a casing body 10, which channel 16allows different bus bar sets 13a-13i, 14a-14g to be arranged therein,permitting different distribution circuits 11, 12 to be constituted.Therefore, a single casing body 10 can do for provision of branchcircuits to be different by vehicle types, grades and/or kinds.

Moreover, a single kind of casing body 10 is permitted to providedifferent branch circuits by a mere substitution of a set of bus bars13a-13i with another set of bus bars 14a-14g, so that a total number ofkinds of casing body can be reduced. Therefore, for a molding of casingbody, a total number of molds can also be reduced. Further, infabrication of junction box, the line can cope with employment of acasing body 10 simply by a modification of machine for insertion of busbars 13a-13i, 14a-14g, permitting a significant cost effect to beachieved.

While preferred embodiments of the present invention have been describedusing specific terms, such description is for illustrative purposes, andit is to be understood that changes and variations may be made withoutdeparting from the spirit or scope of the following claims.

What is claimed is:
 1. An electrical junction box system for a firstvehicle kind requiring a first internal circuit to have a firstconnection circuit for connection of a first set of electrical insertsand a second vehicle kind requiring a second internal circuit to have asecond connection circuit for connection of a second set of electricalinserts, the first and second connection circuits being different fromeach other, the electrical junction box system including:a firstjunction box comprising:a case member molded for defining a firstplurality of external portions for installation of the first set ofelectrical inserts and an internal space including a channel network;and the first internal circuit installed in the internal space, with thefirst connection circuit composed of a combination of first bus bars setin the channel network; and a second junction box comprising:anothersaid case member defining a second plurality of external portions forinstallation of the second set of electrical inserts; and the secondinternal circuit installed in an internal space of said another casemember, with the second connection circuit composed of a combination ofsecond bus bars set in said channel network.
 2. An electrical junctionbox system according to claim 1, wherein:the first set of electricalinserts comprise a number of upstream insert members and a number ofdownstream insert members; and the first plurality of external portionscomprise a first series of housing parts aligned to a first referenceline and adapted for accommodation of the number of upstream insertmembers, and a second series of housing parts aligned to a secondreference line parallel to the first reference line and adapted foraccommodation of the number of downstream insert members.
 3. Anelectrical junction box system according to claim 2, wherein theupstream insert members each comprise a relay member.
 4. An electricaljunction box system according to claim 2, wherein the downstream insertmembers each comprise a fuse member.
 5. An electrical junction boxsystem according to claim 2, wherein:the first set of electrical insertsfurther comprise a number of power supply inserts; and the case memberhas a third series of housing parts aligned to a third reference lineparallel to the first reference line and adapted for accommodation ofthe number of power supply inserts.
 6. An electrical junction box systemaccording to claim 5, wherein the channel network comprises:a firstchannel extending along a first reference plane including the firstreference line; a second channel extending along a second referenceplane including the second reference line; a third channel extendingalong a third reference plane including the third reference line; anumber of fourth channels for intercommunication between the firstchannel and the second channel; and a number of fifth channels forintercommunication between the first channel and the third channel. 7.An electrical junction box system according to claim 6, wherein thecombination of first bus bars includes:a first bus bar member passingthrough the first channel, one of the number of fourth channels, and thesecond channel; and a second bus bar member passing through the firstchannel, one of the number of fifth channels, and the third channel. 8.An electrical junction box system according to claim 1, wherein thefirst bus bars each comprise a vertical bus bar member.
 9. An electricaljunction box for a first vehicle kind requiring a first internal circuitto have a first connection circuit for connection of a first set ofelectrical inserts and a second vehicle kind requiring a second internalcircuit to have a second connection circuit for connection of a secondset of electrical inserts, the first and second connection circuitsbeing different from each other, the electrical junction boxcomprising:a case member molded for defining a plurality of externalportions for installation of a selective one of the first and secondsets of electrical inserts, and an internal space including a channelnetwork; the first internal circuit being adapted to be installed in theinternal space, with the first connection circuit composed of acombination of first bus bars set in the channel network; and the secondinternal circuit being adapted to be installed in the internal space,with the second connection circuit composed of a combination of secondbus bars set in the channel network.
 10. An electrical junction boxaccording to claim 9, wherein:the case member comprises a casing body ofa box form; said selective one of the first and second sets ofelectrical inserts comprises a number of relay members and a number offuse members; and the plurality of external portions comprise a firstseries of housing parts aligned in a longitudinal direction of thecasing body and adapted for installation of the number of relay membersand a second series of housing parts aligned in parallel to the firstseries of housing parts and adapted for installation of the number offuse members.
 11. An electrical junction box according to claim 10,wherein the first and second connection circuits each include a bus barmember having an elongate base portion set at a relay connection partthereof in a first channel of the channel network facing the number ofrelay members, and at a fuse connection part thereof in a second channelof the channel network facing the number of fuse members, the elongatebase portion having an interconnection part interconnecting the relayconnection part and the fuse connection part.